How To Fix CDSUI009 - BOL Structure scanning was stopped because of recursive relations

SAP Error Message - Details

• Message type: E = Error

• Message class: CDSUI - Central Data Source UI messages

• Message number: 009

• Message text: BOL Structure scanning was stopped because of recursive relations

Self-Explanatory Message

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Smart SAP Assistant

• What is the cause and solution for SAP error message CDSUI009 - BOL Structure scanning was stopped because of recursive relations ?

  The SAP error message CDSUI009 indicates that there is an issue with the Business Object Layer (BOL) structure scanning due to recursive relations in your Core Data Services (CDS) views or data models. This typically occurs when there are circular references in the relationships defined in your CDS views, which can lead to infinite loops during the processing of the data model.
  Cause:
  
  Recursive Relationships: The most common cause of this error is the presence of recursive relationships in your CDS views. This means that a data entity is indirectly related to itself through one or more associations.
  Complex Associations: If your CDS views have complex associations that create loops, the BOL structure scanning cannot resolve these relationships, leading to the error.
  Incorrect Model Design: Sometimes, the design of the data model may not be optimal, leading to unintended recursive relationships.
  
  Solution:
  
  Review Associations: Check the associations defined in your CDS views. Look for any circular references or relationships that could lead to recursion. Ensure that associations are defined correctly and do not point back to the same entity in a way that creates a loop.
  Refactor the Model: If you identify recursive relationships, consider refactoring your data model. This may involve breaking down complex associations into simpler ones or redesigning the relationships to avoid recursion.
  Use Annotations: In some cases, you can use annotations to control the behavior of associations and prevent recursion. For example, you can use the @ObjectModel.association annotation to define how associations should behave.
  Testing: After making changes, test your CDS views to ensure that the error is resolved and that the data model behaves as expected.
  Consult Documentation: Refer to SAP documentation for best practices on designing CDS views and managing associations to avoid such issues in the future.
  
  Related Information:
  
  SAP Notes: Check for any relevant SAP Notes that may provide additional insights or fixes related to this error.
  SAP Community: Engage with the SAP Community forums to see if other users have encountered similar issues and what solutions they have found.
  Performance Considerations: Be aware that complex associations can also impact performance, so simplifying your data model can lead to better performance in addition to resolving the error.
  
  By carefully reviewing and adjusting your CDS views and their associations, you should be able to resolve the CDSUI009 error and prevent it from occurring in the future.